A.u. of Linear Momentum (a.u.) is a unit in the category of Linear momentum. It is also known as atomic units, u.a., au. ua. This unit is commonly used in the a.u. unit system. A.u. of Linear Momentum (a.u.) has a dimension of MLT-1 where M is mass, L is length, and T is time. It can be converted to the corresponding standard SI unit N-s by multiplying its value by a factor of 1.992853362E-024.